diff options
Diffstat (limited to 'daemon/display.c')
| -rw-r--r-- | daemon/display.c | 687 |
1 files changed, 0 insertions, 687 deletions
diff --git a/daemon/display.c b/daemon/display.c deleted file mode 100644 index 7a9db56b..00000000 --- a/daemon/display.c +++ /dev/null @@ -1,687 +0,0 @@ -/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- - * - * GDM - The GNOME Display Manager - * Copyright (C) 1998, 1999, 2000 Martin K. Petersen <mkp@mkp.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include "config.h" - -#include <signal.h> -#include <string.h> -#include <sys/wait.h> -#include <sys/types.h> -#include <unistd.h> -#include <fcntl.h> -#include <errno.h> - -#include <glib/gi18n.h> - -#include "gdm.h" -#include "gdm-net.h" -#include "server.h" -#include "display.h" -#include "slave.h" -#include "misc.h" -#include "choose.h" -#include "auth.h" -#include "gdm-net.h" - -#include "gdm-common.h" -#include "gdm-log.h" -#include "gdm-daemon-config.h" - -/* External vars */ -extern GdmConnection *fifoconn; -extern GdmConnection *pipeconn; -extern GdmConnection *unixconn; -extern int slave_fifo_pipe_fd; /* the slavepipe (like fifo) connection, this is the write end */ -extern gint flexi_servers; - -/** - * gdm_display_alloc: - * @id: Local display number - * @command: Command line for starting the X server - * - * Allocate display structure for a local X server - */ - -GdmDisplay * -gdm_display_alloc (gint id, const gchar *command, const gchar *device) -{ - gchar hostname[1024]; - GdmDisplay *d; - - hostname[1023] = '\0'; - if (gethostname (hostname, 1023) == -1) - strcpy (hostname, "localhost.localdomain"); - - d = g_new0 (GdmDisplay, 1); - - d->logout_action = GDM_LOGOUT_ACTION_NONE; - d->authfile = NULL; - d->authfile_gdm = NULL; - d->auths = NULL; - d->userauth = NULL; - d->command = g_strdup (command); - d->cookie = NULL; - d->dispstat = DISPLAY_UNBORN; - d->greetpid = 0; - d->name = g_strdup_printf (":%d", id); - d->hostname = g_strdup (hostname); - d->windowpath = NULL; - /* Not really used for not XDMCP */ - memset (&(d->addr), 0, sizeof (d->addr)); - d->dispnum = id; - d->servpid = 0; - d->servstat = SERVER_DEAD; - d->sesspid = 0; - d->slavepid = 0; - d->type = TYPE_STATIC; - d->attached = TRUE; - d->sessionid = 0; - d->acctime = 0; - d->dsp = NULL; - d->screenx = 0; /* xinerama offset */ - d->screeny = 0; - - d->handled = TRUE; - d->tcp_disallowed = FALSE; - - d->priority = 0; - d->vt = -1; - d->vtnum = -1; - if (device != NULL) - d->device_name = g_strdup (device); - else - d->device_name = NULL; - - d->x_servers_order = -1; - - d->last_loop_start_time = 0; - d->last_start_time = 0; - d->retry_count = 0; - d->sleep_before_run = 0; - d->login = NULL; - d->preset_user = NULL; - - d->timed_login_ok = FALSE; - - d->slave_notify_fd = -1; - d->master_notify_fd = -1; - - d->xsession_errors_bytes = 0; - d->xsession_errors_fd = -1; - d->session_output_fd = -1; - - d->chooser_output_fd = -1; - d->chooser_last_line = NULL; - - d->theme_name = NULL; - - return d; -} - -static gboolean -gdm_display_check_loop (GdmDisplay *disp) -{ - time_t now; - time_t since_last; - time_t since_loop; - - now = time (NULL); - - gdm_debug ("loop check: last_start %ld, last_loop %ld, now: %ld, retry_count: %d", (long)disp->last_start_time, (long) disp->last_loop_start_time, (long) now, disp->retry_count); - - if (disp->last_loop_start_time > now || disp->last_loop_start_time == 0) - { - /* Reset everything if this is the first time in this - * function, or if the system clock got reset backward. - */ - disp->last_loop_start_time = now; - disp->last_start_time = now; - disp->retry_count = 1; - - gdm_debug ("Resetting counts for loop of death detection"); - - return TRUE; - } - - since_loop = now - disp->last_loop_start_time; - since_last = now - disp->last_start_time; - - /* If it's been at least 1.5 minutes since the last startup loop - * attempt, then we reset everything. Or if the last startup was more then - * 30 seconds ago, then it was likely a successful session. - */ - - if (since_loop >= 90 || since_last >= 30) - { - disp->last_loop_start_time = now; - disp->last_start_time = now; - disp->retry_count = 1; - - gdm_debug ("Resetting counts for loop of death detection, 90 seconds elapsed since loop started or session lasted more then 30 seconds."); - - return TRUE; - } - - /* If we've tried too many times we bail out. i.e. this means we - * tried too many times in the 90-second period. - */ - if (disp->retry_count >= 6) { - /* This means we have no clue what's happening, - * it's not X server crashing as we would have - * cought that elsewhere. Things are just - * not working out, so tell the user. - * However this may have been caused by a malicious local user - * zapping the display repeatedly, that shouldn't cause gdm - * to stop working completely so just wait for 2 minutes, - * that should give people ample time to stop gdm if needed, - * or just wait for the stupid malicious user to get bored - * and go away */ - char *s = g_strdup_printf (C_(N_("The display server has been shut down " - "about 6 times in the last 90 seconds. " - "It is likely that something bad is " - "going on. Waiting for 2 minutes " - "before trying again on display %s.")), - disp->name); - /* only display a dialog box if this is a local display */ - if (disp->type == TYPE_STATIC || - disp->type == TYPE_FLEXI) { - gdm_text_message_dialog (s); - } - gdm_error ("%s", s); - g_free (s); - - /* Wait 2 minutes */ - disp->sleep_before_run = 120; - /* well, "last" start time will really be in the future */ - disp->last_start_time = now + disp->sleep_before_run; - - disp->retry_count = 1; - /* this will reset stuff in the next run (after this - "after-two-minutes" server starts) */ - disp->last_loop_start_time = 0; - - return TRUE; - } - - /* At least 8 seconds between start attempts, but only after - * the second start attempt, so you can try to kill gdm from the console - * in these gaps. - */ - if (disp->retry_count > 2 && since_last < 8) - { - gdm_debug ("Will sleep %ld seconds before next X server restart attempt", - (long)(8 - since_last)); - now = time (NULL) + 8 - since_last; - disp->sleep_before_run = 8 - since_last; - /* well, "last" start time will really be in the future */ - disp->last_start_time = now + disp->sleep_before_run; - } - else - { - /* wait one second just for safety (avoids X server races) */ - disp->sleep_before_run = 1; - disp->last_start_time = now; - } - - disp->retry_count++; - - return TRUE; -} - -static void -whack_old_slave (GdmDisplay *d, gboolean kill_connection) -{ - time_t t = time (NULL); - gboolean waitsleep = TRUE; - - if (kill_connection) { - /* This should never happen, but just in case */ - if (d->socket_conn != NULL) { - GdmConnection *conn = d->socket_conn; - d->socket_conn = NULL; - gdm_connection_set_close_notify (conn, NULL, NULL); - } - } - - if (d->master_notify_fd >= 0) { - VE_IGNORE_EINTR (close (d->master_notify_fd)); - d->master_notify_fd = -1; - } - - /* if we have DISPLAY_DEAD set, then this has already been killed */ - if (d->dispstat == DISPLAY_DEAD) - waitsleep = FALSE; - - /* Kill slave */ - if (d->slavepid > 1 && - (d->dispstat == DISPLAY_DEAD || kill (d->slavepid, SIGTERM) == 0)) { - int exitstatus; - int ret; -wait_again: - - if (waitsleep) - /* wait for some signal, yes this is a race */ - sleep (10); - waitsleep = TRUE; - errno = 0; - ret = waitpid (d->slavepid, &exitstatus, WNOHANG); - if (ret <= 0) { - /* rekill the slave to tell it to - hurry up and die if we're getting - killed ourselves */ - if ((gdm_daemon_config_signal_terminthup_was_notified ()) || - (t + 10 <= time (NULL))) { - gdm_debug ("whack_old_slave: GOT ANOTHER SIGTERM (or it was 10 secs already), killing slave again with SIGKILL"); - t = time (NULL); - kill (d->slavepid, SIGKILL); - goto wait_again; - } else if (ret < 0 && errno == EINTR) { - goto wait_again; - } - } - - if (WIFSIGNALED (exitstatus)) { - gdm_debug ("whack_old_slave: Slave crashed (signal %d), killing its children", - (int)WTERMSIG (exitstatus)); - - if (d->sesspid > 1) - kill (-(d->sesspid), SIGTERM); - d->sesspid = 0; - if (d->greetpid > 1) - kill (-(d->greetpid), SIGTERM); - d->greetpid = 0; - if (d->chooserpid > 1) - kill (-(d->chooserpid), SIGTERM); - d->chooserpid = 0; - if (d->servpid > 1) - kill (d->servpid, SIGTERM); - d->servpid = 0; - } - } - d->slavepid = 0; -} - -/** - * gdm_display_manage: - * @d: Pointer to a GdmDisplay struct - * - * Manage (Initialize and start login session) display - */ - -gboolean -gdm_display_manage (GdmDisplay *d) -{ - pid_t pid; - int fds[2]; - - if (!d) - return FALSE; - - gdm_debug ("gdm_display_manage: Managing %s", d->name); - - if (pipe (fds) < 0) { - gdm_error (_("%s: Cannot create pipe"), "gdm_display_manage"); - } - - if ( ! gdm_display_check_loop (d)) - return FALSE; - - if (d->slavepid != 0) - gdm_debug ("gdm_display_manage: Old slave pid is %d", (int)d->slavepid); - - /* If we have an old slave process hanging around, kill it */ - /* This shouldn't be a normal code path however, so it doesn't matter - * that we are hanging */ - whack_old_slave (d, FALSE /* kill_connection */); - - /* Ensure that /tmp/.ICE-unix and /tmp/.X11-unix exist and have the - * correct permissions */ - gdm_ensure_sanity (); - - d->managetime = time (NULL); - - g_debug ("Forking slave process"); - - /* Fork slave process */ - pid = d->slavepid = fork (); - - switch (pid) { - - case 0: - setpgid (0, 0); - - /* Make the slave it's own leader. This 1) makes killing -pid of - * the daemon work more sanely because the daemon can whack the - * slave much better itself */ - setsid (); - - /* In the child setup empty mask and set all signals to - * default values, we'll make them more fun later */ - gdm_unset_signals (); - - d->slavepid = getpid (); - - gdm_connection_close (fifoconn); - fifoconn = NULL; - gdm_connection_close (pipeconn); - pipeconn = NULL; - gdm_connection_close (unixconn); - unixconn = NULL; - - gdm_log_shutdown (); - - /* Close everything */ - gdm_close_all_descriptors (0 /* from */, fds[0] /* except */, slave_fifo_pipe_fd /* except2 */); - - /* No error checking here - if it's messed the best response - * is to ignore & try to continue */ - gdm_open_dev_null (O_RDONLY); /* open stdin - fd 0 */ - gdm_open_dev_null (O_RDWR); /* open stdout - fd 1 */ - gdm_open_dev_null (O_RDWR); /* open stderr - fd 2 */ - - gdm_log_init (); - - d->slave_notify_fd = fds[0]; - - fcntl (d->slave_notify_fd, F_SETFL, fcntl (d->slave_notify_fd, F_GETFL) | O_NONBLOCK); - - gdm_slave_start (d); - /* should never retern */ - - /* yaikes, how did we ever get here? */ - gdm_server_stop (d); - _exit (DISPLAY_REMANAGE); - - break; - - case -1: - d->slavepid = 0; - gdm_error (_("%s: Failed forking GDM slave process for %s"), - "gdm_display_manage", - d->name); - - return FALSE; - - default: - gdm_debug ("gdm_display_manage: Forked slave: %d", - (int)pid); - d->master_notify_fd = fds[1]; - VE_IGNORE_EINTR (close (fds[0])); - break; - } - - /* invalidate chosen hostname */ - g_free (d->chosen_hostname); - d->chosen_hostname = NULL; - - /* use_chooser can only be temporary, if you want it permanent you set it up - in the server definition with "chooser=true" and it will get set up during - server command line resolution */ - d->use_chooser = FALSE; - - if (SERVER_IS_LOCAL (d)) { - d->dispstat = DISPLAY_ALIVE; - } - - /* reset sleep to 1, to sleep just in case (avoids X server races) */ - d->sleep_before_run = 1; - - return TRUE; -} - - -/** - * gdm_display_unmanage: - * @d: Pointer to a GdmDisplay struct - * - * Stop services for a display - */ -void -gdm_display_unmanage (GdmDisplay *d) -{ - if (!d) - return; - - gdm_debug ("gdm_display_unmanage: Stopping %s (slave pid: %d)", - d->name, (int)d->slavepid); - - /* whack connections about this display */ - if (unixconn != NULL) - gdm_kill_subconnections_with_display (unixconn, d); - - /* Kill slave, this may in fact hang for a bit at least until the - * slave dies, which should be ASAP though */ - whack_old_slave (d, TRUE /* kill_connection */); - - d->dispstat = DISPLAY_DEAD; - if (d->type != TYPE_STATIC || d->removeconf) - gdm_display_dispose (d); - - gdm_debug ("gdm_display_unmanage: Display stopped"); -} - - -/* Why recount? It's just a lot more robust this way and - gets around those nasty one off errors and races. And we never - have so many displays that this would get too slow. */ -static void -count_session_limits (void) -{ - GSList *li; - GSList *displays; - - displays = gdm_daemon_config_get_display_list (); - - flexi_servers = 0; - - for (li = displays; li != NULL; li = li->next) { - GdmDisplay *d = li->data; - - if (SERVER_IS_FLEXI (d)) { - flexi_servers++; - } - } -} - -/** - * gdm_display_dispose: - * @d: Pointer to a GdmDisplay struct - * - * Deallocate display and all its resources - */ - -void -gdm_display_dispose (GdmDisplay *d) -{ - - if (d == NULL) - return; - - /* paranoia */ - if (unixconn != NULL) - gdm_kill_subconnections_with_display (unixconn, d); - - if (d->socket_conn != NULL) { - GdmConnection *conn = d->socket_conn; - d->socket_conn = NULL; - gdm_connection_set_close_notify (conn, NULL, NULL); - } - - if (d->slave_notify_fd >= 0) { - VE_IGNORE_EINTR (close (d->slave_notify_fd)); - d->slave_notify_fd = -1; - } - - if (d->master_notify_fd >= 0) { - VE_IGNORE_EINTR (close (d->master_notify_fd)); - d->master_notify_fd = -1; - } - - gdm_daemon_config_display_list_remove (d); - - d->dispstat = DISPLAY_DEAD; - d->type = -1; - - count_session_limits (); - - if (d->name) { - gdm_debug ("gdm_display_dispose: Disposing %s", d->name); - g_free (d->name); - d->name = NULL; - } - - g_free (d->chosen_hostname); - d->chosen_hostname = NULL; - - g_free (d->hostname); - d->hostname = NULL; - - g_free (d->windowpath); - d->windowpath = NULL; - - g_free (d->addrs); - d->addrs = NULL; - d->addr_count = 0; - - g_free (d->authfile); - d->authfile = NULL; - - g_free (d->authfile_gdm); - d->authfile_gdm = NULL; - - if (d->type == TYPE_XDMCP_PROXY) { - if (d->parent_auth_file != NULL) { - VE_IGNORE_EINTR (g_unlink (d->parent_auth_file)); - } - g_free (d->parent_auth_file); - d->parent_auth_file = NULL; - } - - if (d->parent_temp_auth_file != NULL) { - VE_IGNORE_EINTR (g_unlink (d->parent_temp_auth_file)); - } - g_free (d->parent_temp_auth_file); - d->parent_temp_auth_file = NULL; - - if (d->auths) { - gdm_auth_free_auth_list (d->auths); - d->auths = NULL; - } - - if (d->local_auths) { - gdm_auth_free_auth_list (d->local_auths); - d->local_auths = NULL; - } - - g_free (d->userauth); - d->userauth = NULL; - - g_free (d->windowpath); - d->windowpath = NULL; - - g_free (d->command); - d->command = NULL; - - g_free (d->device_name); - d->device_name = NULL; - - g_free (d->cookie); - d->cookie = NULL; - - g_free (d->bcookie); - d->bcookie = NULL; - - if (d->indirect_id > 0) - gdm_choose_indirect_dispose_empty_id (d->indirect_id); - d->indirect_id = 0; - - g_free (d->parent_disp); - d->parent_disp = NULL; - - g_free (d->parent_auth_file); - d->parent_auth_file = NULL; - - g_free (d->login); - d->login = NULL; - - g_free (d->preset_user); - d->preset_user = NULL; - - g_free (d->xsession_errors_filename); - d->xsession_errors_filename = NULL; - - if (d->session_output_fd >= 0) { - VE_IGNORE_EINTR (close (d->session_output_fd)); - d->session_output_fd = -1; - } - - if (d->xsession_errors_fd >= 0) { - VE_IGNORE_EINTR (close (d->xsession_errors_fd)); - d->xsession_errors_fd = -1; - } - - g_free (d->chooser_last_line); - d->chooser_last_line = NULL; - - if (d->chooser_output_fd >= 0) { - VE_IGNORE_EINTR (close (d->chooser_output_fd)); - d->chooser_output_fd = -1; - } - - g_free (d->theme_name); - d->theme_name = NULL; - - g_free (d->xserver_session_args); - d->xserver_session_args = NULL; - - g_free (d); -} - - -/** - * gdm_display_lookup: - * @pid: pid of slave process to look up - * - * Return the display managed by pid - */ - -GdmDisplay * -gdm_display_lookup (pid_t pid) -{ - GSList *li; - GSList *displays; - - displays = gdm_daemon_config_get_display_list (); - - /* Find slave in display list */ - for (li = displays; li != NULL; li = li->next) { - GdmDisplay *d = li->data; - - if (d != NULL && - pid == d->slavepid) - return d; - } - - /* Slave not found */ - return NULL; -} - - -/* EOF */ |